Answer: Check for the presence of antibodies in the blood
Explanation:
A person can only have antibodies for a virus if they got the virus in the first place
Thin protective membrane in some protozoa
Answer:
Because of the vast differences in the seasons
Explanation:
Global warming doesnt only pertain to the rise in heat levels but the major diffrence in each season. this means winters are extreamly cold and summers are unbearably heated